US4568989A - Mode changing apparatus for a tape recorder - Google Patents

Mode changing apparatus for a tape recorder Download PDF

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Publication number
US4568989A
US4568989A US06/433,643 US43364382A US4568989A US 4568989 A US4568989 A US 4568989A US 43364382 A US43364382 A US 43364382A US 4568989 A US4568989 A US 4568989A
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US
United States
Prior art keywords
gear
magnet
changing gear
operating member
changing apparatus
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/433,643
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English (en)
Inventor
Kenji Ohhara
Yoshinori Yamamoto
Masao Ri
Hisanori Watanabe
Yasuo Osada
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OHHARA, KENJI, OSADA, YASUO, RI, MASAO, WATANABE, HISANORI, YAMAMOTO, YOSHINOTI
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/1883—Driving; Starting; Stopping; Arrangements for control or regulation thereof for record carriers inside containers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/10—Manually-operated control; Solenoid-operated control

Definitions

  • This invention relates to a mode changing apparatus for a tape recorder, and more particularly is directed to improvements in a mode changing apparatus of the feather-touch push-button type.
  • an electromagnet is employed for establishing each of the selected modes of operation, for example, for moving a head base plate or carriage from an inactive position to an active position in which the tape is engaged by a head or heads on the base plate and/or for displacement of a pinch roller to an operative position against an associated capstan for driving the tape therebetween during a recording or reproducing operation.
  • Such electromagnet requires a current supply thereto during the entire recording or reproducing operation, that is, upon interruption of the current supply to the electromagnet, the head base plate or carriage is returned by a spring to its inactive position for spacing the head or heads from the tape and/or for separating the pinch roller from the capstan.
  • the electromagnet used in such conventional mode changing apparatus needs to be relatively large for maintaining the head base plate in its active position against the force of the return spring and, accordingly, such electromagnet imposes a disadvantageously large current drain which is not suited for a battery-powered tape recorder.
  • a further object of this invention is to provide a mode changing apparatus, as aforesaid, which employs a relatively small-sized electromagnetic assembly for triggering the operation of the mode changing apparatus by an electric motor, for example, in response to actuation of a switch of the feather-touch, push-button type and in which the electromagnetic assembly further functions to hold or lock the mode changing apparatus in its active condition for selecting the respective operating mode.
  • a mode changing apparatus is provided with a rotatable changing gear having a toothed periphery with a toothless gap therein, a magnet rotatably coupled with the changing gear for rotation with the latter, a driving gear rotatably mounted adjacent the changing gear and being engageable with the toothed periphery for driving the changing gear in response to operation of an electric motor coupled with the driving gear, yoke means including one portion cooperating with the magnet in an initial position of the changing gear for providing a stabilizing effect by which the changing gear is held in its initial position with the toothless gap facing the driving gear for avoiding engagement of the latter with the toothed periphery, a solenoid coil wound on another portion of the yoke means and being operative, when energized, to generate a magnetic force by which the magnet and changing gear are angularly displaced from said initial position for engagement of the toothed periphery by the rotated driving gear to cause turning of the changing gear, an operating member, such as
  • the yoke means includes a first substantially U-shaped portion defining a first magnetic path for generation of the magnetic force by which the magnet and changing gear are angularly displaced from the initial position upon energizing of the solenoid coil, and a second substantially U-shaped portion defining a second magnetic path having a magnetic resistance greater than that of the first magnetic path when the armature means is in its free position and against which said armature means is held in the holding position of the latter to convert the second magnetic path to a closed path of low magnetic resistance.
  • FIG. 1 is a schematic plan view of a mode changing apparatus according to an embodiment of this invention, and which is shown in an inactive position or condition corresponding to a STOP mode of an associated tape recorder;
  • FIG. 2 is a view similar to that of FIG. 1, but showing the mode changing apparatus in the course of its operation for changing-over the associated tape recorder from the STOP mode to a FORWARD mode for a recording or reproducing operation;
  • FIGS. 3 and 4 are fragmentary plan views corresponding to a portion of the structure shown in FIGS. 1 and 2, and illustrating other phases of the operation of the mode changing apparatus to which reference will be made in explaining such operation;
  • FIG. 5 is a fragmentary plan view corresponding to a portion of FIG. 1, and showing a mode changing apparatus according to another embodiment of this invention.
  • a mode changing apparatus for a tape recorder in accordance with an embodiment of this invention is there illustrated schematically to comprise a changing gear 1 having a toothed periphery with a toothless gap 2 therein.
  • the changing gear 1 is rotatable on a suitably mounted shaft 3 which also carries a permanent magnet 4 and a cam 5 rotatably coupled with changing gear 1.
  • the magnet 4 is shown to have oppositely magnetized or north and south poles N and S which are substantially diametrically opposed to each other, that is, angularly displaced from each other by approximately 180° about the axis of shaft 3.
  • Cam 5 is shown to be substantially sector-shaped so as to present a radially high surface 5a having an angular extent of, for example, about 60°.
  • a driving gear 6 is mounted on a rotatable shaft 7 of an electric drive motor (not shown) and is disposed adjacent changing gear 1 so as to be engageable with the toothed periphery of the latter, as on FIGS. 2 and 3, for driving the changing gear.
  • the mode changing apparatus is further shown to generally comprise an electromagnetic assembly 10 including a yoke or core 11 having a first substantially U-shaped portion 12 defining a first magnetic path, a second U-shaped portion 13 extending substantially at right angles to the first U-shaped portion 12 and being formed integrally with the latter so as to have a yoke portion 14 in common therewith.
  • the second U-shaped yoke portion 13 defines a second magnetic path which, considering only the yoke 11, has a magnetic resistance greater than that of the first magnetic path defined by U-shaped yoke portion 12.
  • the difference between the magnetic resistances of the first and second magnetic paths may be caused by differences between the materials of which the yoke portions 12 and 13 are respectively formed, or by differences between the cross-sectional areas of such yoke portions 12 and 13.
  • a solenoid coil 15 is wound around the common portion 14 of the U-shaped yoke portions 12 and 13 and is adapted to be selectively energized from a suitable voltage source 8, as shown on FIGS. 2, 3 and 4.
  • the yoke 11 is positioned, as shown on FIG. 1, so that the ends 12a and 12b of first U-shaped yoke portion 12 extend above and below, respectively, and are adjacent to magnet 4 on shaft 3.
  • a stabilizing yoke portion 16 extending adjacent magnet 4 at a position intermediate ends 12a and 12b of yoke portion 12.
  • yoke portion 16 cooperates with magnet 4 to provide a stabilizing effect by which changing gear 1 is normally held in its initial position shown on FIG. 1 and in which the toothless gap 2 faces driving gear 6 for normally avoiding engagement of the driving gear with the toothed periphery of changing gear 1.
  • An operating member 18 which, in the illustrated embodiment of the invention, is represented as a head base plate or carriage, is mounted, as by pin and slot connections 18a, for movement in the reciprocal directions of the arrows a and b between an inactive position (FIG. 1) and an active position (FIG. 2).
  • a magnetic recording and/or reproducing head 19 is mounted on base plate 18 for movement with the latter so as to engage a magnetic tape (not shown) when base plate or carriage 18 is in its active position.
  • a pinch roller (not shown) may be mounted on base plate 18 or otherwise coupled with the latter so as to engage the tape between such pinch roller and a rotated capstan (not shown) when base plate 18 is moved to its active position for forward driving of the tape during a recording or reproducing operation of the tape recorder.
  • a spring 20 is connected to base plate 18 for yieldably urging the latter in the direction of the arrow b to the inactive position of the base plate.
  • An actuating means for head base plate 18 is shown to include, in addition to cam 5, an actuating lever 22 which is pivotally mounted intermediate its ends, as at 23, and which has one end portion 22a acting as a cam follower and engageable with the peripheral surface of cam 5.
  • the opposite end portion 22b of actuating lever 22 is engageable with a flange 24 on head base plate 18. It will be apparent that the urging of head base plate 18 in the direction of the arrow b by spring 20 serves to angularly bias actuating lever 22 in the counterclockwise direction, as viewed on FIGS. 1 and 2, for urging end portion 22a of the actuating lever against cam 5.
  • a locking lever 26 is pivotally mounted, at one end, on a pivot pin 27, and is yieldably urged to pivot in the counterclockwise direction on FIG. 1, that is, in the direction of the arrow c, by a spring 28.
  • the pivotal movement of locking lever 26 by spring 28 serves to urge an abutment or pin 29 on lever 26 against a stop surface 30 on head base plate 18.
  • the position of head base plate 18 determines the position to which lever 26 can be urged by spring 28.
  • Springs 20 and 28 are dimensioned so that the force of spring 20 predominates over the force of spring 28. Accordingly, when actuating lever 22 is in the position shown on FIG.
  • the above described mode changing apparatus operates as follows:
  • magnet 4 has its north and south poles N and S disposed along a diametric line which is substantially perpendicular to a line connecting ends 12a and 12b of the first yoke portion 12.
  • its north and south poles N and S are positioned as far as possible from ends 12a and 12b of yoke portion 12. Accordingly, in the stop or initial position of changing gear 1, ends 12a and 12b of yoke portion 12 are affected as little as possible by the magnetizing force of magnet 4.
  • the usual FORWARD button (not shown) of the tape recorder is depressed for actuating a respective switch with the result that an electric current is suitably supplied to solenoid 15 in the direction to generate magnetic flux ⁇ 1 in U-shaped yoke portion 12 (FIG. 3) which provides north and south magnetic poles N and S at ends 12a and 12b.
  • the magnetic resistance of the second magnetic path defined in yoke portion 13 is substantially greater than the magnetic resistance of the first magnetic path defined in yoke portion 12 since armature member 32 is in its free position spaced from ends 13a and 13b of yoke portion 13.
  • the electric current supply to solenoid 15 is substantially fully utilized for generating the desired magnetic flux ⁇ 1 in yoke portion 12.
  • the south and north poles S and N of magnet 4 are positioned as far as possible from ends 12a and 12b of yoke portion 12 so that the magnetizing force of magnet 4 will affect such ends 12a and 12b as little as possible. Therefore, there is no need to reverse the polarity of magnetization at ends 12a and 12b, and the desired north and south polarities N and S at ends 12a and 12b, respectively, can be achieved with only a relatively small current being supplied to solenoid coil 15. From th foregoing, it will be appreciated that the mode changing apparatus according to this invention is efficient in its consumption of electric power so as to be well suited for incorporation in a battery powered or portable tape recorder.
  • cam 5 is turned with changing gear 1 so as to bring its radially high surface 5a into engagement with end portion 22a of actuating lever 22 for rocking the latter in the direction of the arrow f on FIG. 2.
  • the rocking of actuating lever 22 in the direction of the arrow f causes end portion 22b to bear against flange 24 of head base plate 18 and to move the latter in the direction of the arrow a to its active position against the force of spring 20.
  • head 19 Due to such movement of head base plate 18 to its active position, head 19 is brought into contact with the magnetic tape and the pinch roller (not shown) is pressed against the associated capstan with the result that the FORWARD mode of the tape recorder is established for the performance of a recording or reproducing operation.
  • the magnetic flux due to the supplying of electric current from voltage source 8 to solenoid coil 15 is switched from a magnetic path in yoke portion 12 to a closed magnetic path in yoke portion 13 and armature member 32 as a result of the turning of cam 5 to the position shown on FIG. 2 and the consequent movement of the operating member or head base plate 18 to its active position.
  • the magnetic flux ⁇ 1 in yoke portion 12 has been substantially minimized, the rotative force or torque acting on changing gear 1 due to the interaction of magnetic flux ⁇ 1 with magnet 4 is substantially eliminated and changing gear 1 is free to be further rotated by driving gear 6 until changing gear 1 returns to its initial position and is disengaged from gear 6, as shown on FIG. 4.
  • yoke portion 16 Upon return of changing gear 1 to its initial position, yoke portion 16 again cooperates with the south pole S of magnet 4 for stabilizing changing gear 1 in such initial position. Further, upon the return of changing gear 1 to its initial position, and for so long as solenoid coil 15 remains energized, armature member 32 continues to be magnetically attracted to ends 13a and 13b of yoke portion 13 and remains in its holding position. While armature member 32 is magnetically retained in its holding position, the abutment pin 29 on locking lever 26, by its engagement with surface 30 on head base plate 18, locks or holds base plate 18 in its active position against the return force of spring 20 even though the radially high surface 5a of cam 5 no longer engages end portion 22a of actuating lever 22.
  • the electric current supplied to solenoid coil 15 need only be large enough to provide the magnetic flux ⁇ 2 in a closed magnetic path which is sufficient to retain armature member 32 in its holding position against yoke portion 13, but need not be so large as to attract or move the armature member 32 against yoke member 13 from a free position spaced from the latter.
  • the locking of head base plate 18 in its active position is electrically controlled, that is, the locking of head base plate 18 in its active position is dependent upon the supplying of electric current to solenoid coil 15 for retaining armature member 32 in its holding position. Therefore, the locking of the mechanism in the condition for establishing the FORWARD mode can be easily released for returning the mechanism to the STOP mode merely by interrupting the supplying of current to coil 15, and this is particularly advantageous in the case of remote control of the tape recorder operations.
  • the yoke portion 16 for stabilizing magnet 4 and changing gear 1 in the initial position of the latter is omitted, and ends 12'a and 12'b of yoke portion 12 are angled toward each other so as to be angularly displaced from each other by approximately 90° about the axis of shaft 3. Further, the end 12'a of yoke portion 12 is shown to be substantially closer than end 12'b to the center of rotation of magnet 4 on shaft 3. In the embodiment of FIG.
  • the diametrically opposed poles N and S of magnet 4 are shown to be angularly positioned in respect to the toothless gap 2 of changing gear 1 so that, in the initial position of changing gear 1 in which toothless gap 2 faces driving gear 6, the north pole N of magnet 4 is near to the relatively closely disposed end 12'a of yoke portion 12.
  • the resulting magnetic attraction between such north pole N and end 12'a of yoke portion 12 serves to magnetically stabilize changing gear 1 in its initial position.
  • mode changing apparatus capable of selectively establishing the FORWARD and STOP modes of a tape recorder
  • mode changing apparatus for changing-over between various other operating modes, such as, the usual FAST-FORWARD, REWIND, REVERSE and PAUSE modes.

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  • Electromagnets (AREA)
  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)
US06/433,643 1981-10-21 1982-10-12 Mode changing apparatus for a tape recorder Expired - Lifetime US4568989A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56168075A JPS5870448A (ja) 1981-10-21 1981-10-21 切換機構
JP56-168075 1981-10-21

Publications (1)

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US4568989A true US4568989A (en) 1986-02-04

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US06/433,643 Expired - Lifetime US4568989A (en) 1981-10-21 1982-10-12 Mode changing apparatus for a tape recorder

Country Status (9)

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US (1) US4568989A (enrdf_load_stackoverflow)
JP (1) JPS5870448A (enrdf_load_stackoverflow)
KR (1) KR880000838B1 (enrdf_load_stackoverflow)
AT (1) AT376317B (enrdf_load_stackoverflow)
CA (1) CA1203021A (enrdf_load_stackoverflow)
DE (1) DE3238715A1 (enrdf_load_stackoverflow)
FR (1) FR2514928B1 (enrdf_load_stackoverflow)
GB (1) GB2108751B (enrdf_load_stackoverflow)
NL (1) NL190998C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4649446A (en) * 1984-01-19 1987-03-10 U.S. Philips Corporation Switching mechanism for the deck of a magnetic-tape-cassette apparatus
US4649440A (en) * 1984-08-30 1987-03-10 U.S. Philips Corporation Magnetic-tape-cassette apparatus with impulse reset to the rest position
US4717983A (en) * 1984-04-06 1988-01-05 Clarion Co., Ltd Device for operating a plunger in a tape player
US20040099483A1 (en) * 2002-08-09 2004-05-27 Song Yoo Cheol Automatic lubricator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58141458A (ja) * 1982-02-15 1983-08-22 Toshiba Corp テ−プレコ−ダの駆動機構
JPS58171748A (ja) * 1982-03-31 1983-10-08 Sony Corp テ−プレコ−ダのモ−ド切換機構
JPS6044235U (ja) * 1983-08-30 1985-03-28 株式会社ゼロエンジニアリング カム作動機構
NL8402145A (nl) * 1984-07-06 1986-02-03 Philips Nv Magneetbandcassetteapparaat met een servoorgaan.
DE3714702A1 (de) * 1987-05-02 1988-11-17 Philips Patentverwaltung Vorrichtung zum verstellen eines funktionsteiles in einem elektrischen geraet
JP7288415B2 (ja) 2020-03-23 2023-06-07 株式会社東芝 電力増幅装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976263A (en) * 1974-10-29 1976-08-24 Technical Incorporated Operating system in a magnetic tape reproducer and recorder
US4167764A (en) * 1977-09-14 1979-09-11 Sony Corporation Mode changing apparatus in a tape recorder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2832753A1 (de) * 1977-07-29 1979-02-08 Hauser Raimund Einrichtung zur anhaltung, fixierung o.dgl. bewegter bauteile
JPS5923238Y2 (ja) * 1978-10-25 1984-07-11 ソニー株式会社 操作切換装置
JPS606025B2 (ja) * 1979-05-21 1985-02-15 ソニー株式会社 切換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976263A (en) * 1974-10-29 1976-08-24 Technical Incorporated Operating system in a magnetic tape reproducer and recorder
US4167764A (en) * 1977-09-14 1979-09-11 Sony Corporation Mode changing apparatus in a tape recorder

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4649446A (en) * 1984-01-19 1987-03-10 U.S. Philips Corporation Switching mechanism for the deck of a magnetic-tape-cassette apparatus
US4717983A (en) * 1984-04-06 1988-01-05 Clarion Co., Ltd Device for operating a plunger in a tape player
US4649440A (en) * 1984-08-30 1987-03-10 U.S. Philips Corporation Magnetic-tape-cassette apparatus with impulse reset to the rest position
US20040099483A1 (en) * 2002-08-09 2004-05-27 Song Yoo Cheol Automatic lubricator

Also Published As

Publication number Publication date
JPS5870448A (ja) 1983-04-26
KR880000838B1 (ko) 1988-05-14
NL190998C (nl) 1994-12-01
NL190998B (nl) 1994-07-01
FR2514928A1 (fr) 1983-04-22
KR840002134A (ko) 1984-06-11
DE3238715C2 (enrdf_load_stackoverflow) 1991-10-17
DE3238715A1 (de) 1983-04-28
CA1203021A (en) 1986-04-08
AT376317B (de) 1984-11-12
ATA386582A (de) 1984-03-15
GB2108751A (en) 1983-05-18
GB2108751B (en) 1985-04-03
FR2514928B1 (fr) 1986-04-11
NL8204078A (nl) 1983-05-16
JPS6360453B2 (enrdf_load_stackoverflow) 1988-11-24

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